﻿<p>Instances of <em>IfcStructuralSurfaceConnection</em> describe face 'nodes', i.e. faces where two or more surface members are joined, or face supports.  Face surfaces may be planar or curved.</p>

<blockquote class="history">
HISTORY&nbsp; New entity in IFC2x2.
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<blockquote class="change-ifc2x4">
IFC4 CHANGE&nbsp; Use definitions added.
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<p><b><u>Coordinate Systems</u></b>:</p>

<p>See definitions at <em>IfcStructuralItem</em>.  The local coordinate system is established by the reference surface given by topology representation.</p>

<p><b><u>Topology Use Definitions</u></b>:</p>

<p>Instances of <em>IfcStructuralSurfaceConnection</em> shall have a topology representation which consists of one <em>IfcFaceSurface</em>, representing the reference surface of the surface connection.  See definitions at <em>IfcStructuralItem</em> for further specifications.</p>